As the Executor and the remainder of Vader's Star Destroyerfleet, the Imperial Death Squadron, chased the fugitive Rebel freighter, the Millennium Falcon, through the Hoth asteroid field in the aftermath of the Hoth battle and subsequently lost the ship once it disappeared from its pursuers near the Anoat system, Vader executed another fleet officer, CaptainLorth Needa, for his incompetence. Suba was present nearby, standing at Piett's side aboard the bridge, when Vader proceeded to order his admiral to deploy the fleet and calculate every possible escape trajectory the Millennium Falcon may have taken, before issuing a clear warning to Piett that further failure would not be tolerated. Following Piett's relaying order to deploy the Imperial Star Destroyers of Death Squadron, Suba snapped into action to carry out the command.[1]

Suba was again present aboard the Executor's bridge when the Super Star Destroyer failed to intercept the Millennium Falcon as it escaped from Imperial forces on Bespin'sCloud City. Once more Suba flanked Piett as Vader inquired whether or not the Millennium Falcon's hyperdrive had been deactivated during its Imperial impounding on Cloud City, as well as the Dark Lord's subsequent command to ready a boarding party with weapons set to stun to capture Luke Skywalker and the remaining Rebels aboard.[1]

While Darth Vader intended to capture Luke Skywalker in order to turn the young Jedi to the dark side of the Force, Suba disapproved of Vader's reluctance to simply kill Skywalker,[2] although he refrained from voicing his opinion.[4] Suba, a Human, had brownhair, blue eyes, and light skin.[1]